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Taiwan Semiconductor Corporation SK12B
- Part No.:
- SK12B
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SK12B.pdf
- Description:
- DIODE SCHOTTKY 20V 1A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,555
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Product details
Overview
SK12B from Taiwan Semiconductor is a 1A, 20V Schottky barrier surface-mount rectifier in DO-214AA (SMB) package, optimized for low forward voltage drop (0.50 V at 1 A, 25°C), high surge current capability (30 A), and operation up to 125°C junction temperature. It serves as a primary output rectifier in compact switching mode power supplies and AC/DC adapters.
For engineers reviewing the SK12B datasheet, SK12B pinout, SK12B application, or SK12B equivalent, key selection criteria include its 20 V repetitive peak reverse voltage, 1 A average forward current rating, 25 °C/W junction-to-lead thermal resistance, cathode-band polarity marking, and RoHS/halogen-free compliance for consumer and industrial power conversion designs.
Technical Context
The SK12B implements a single-die Schottky barrier structure with guard ring overvoltage protection, enabling fast recovery and low switching losses. Its 0.50 V forward voltage at 1 A and 25°C directly reduces conduction loss in high-frequency SMPS topologies.
Rated for 30 A non-repetitive surge current (8.3 ms half-sine), it withstands transient load events in adapter and lighting applications. The device operates across –55°C to +125°C junction range and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in DC-DC output stage |
| IF(AV) | 1 A - Continuous average forward current; sets maximum steady-state power delivery capability |
| VF | 0.50 V @ 1 A, 25°C - Low conduction loss improves efficiency in 5–24 V output rails |
| IFSM | 30 A - Peak surge current handling supports inrush and fault transients without failure |
| TJ max | 125°C - Maximum junction temperature; enables use in thermally constrained enclosures |
| RθJL | 25°C/W - Junction-to-lead thermal resistance; informs heatsinking requirements for PCB copper area |
| IR | 500 µA @ 20 V, 25°C - Low leakage preserves efficiency in standby and light-load conditions |
Pinout & Package
Package: DO-214AA (SMB), surface-mount plastic case with cathode band polarity indicator, 0.093 g mass, UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., transformer secondary center-tap or switch node) |
| Cathode | Forward current exit point | Connected to output filter capacitor positive terminal; marked by visible band |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances ruggedness against voltage transients and edge breakdown in 20 V-rated devices |
| Moisture sensitivity level 1 | Enables direct placement without baking; compatible with standard SMT reflow profiles |
| Matte tin-plated leads | Ensures reliable solder joint formation per J-STD-002, eliminating post-reflow defects |
| RoHS and halogen-free | Meets IEC 61249-2-21 and global environmental compliance for consumer electronics |
Applications
| AC/DC Adapters | LED Lighting Drivers |
|---|---|
Use Scenario: 12 V/1 A isolated flyback adapter for IoT sensors and smart home devices. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: 0.50 V VF minimizes heat generation in sealed plastic housings where airflow is restricted. | Use Scenario: Constant-current LED driver for commercial downlights with 20–36 V output range. IC Role / Device Role / Timing Role: Secondary-side synchronous rectification replacement in quasi-resonant topology. Use Value: 30 A IFSM rating handles startup surges during cold LED string turn-on without derating. |
| USB Power Delivery Modules | Industrial DC-DC Converters |
Use Scenario: 5 V/1 A buck-derived USB-C port in portable test equipment. IC Role / Device Role / Timing Role: Input-side rectifier for auxiliary 5 V rail derived from main 12 V bus. Use Value: DO-214AA footprint allows dense layout while maintaining >1 mm creepage for safety isolation. | Use Scenario: 24 V input front-end rectification in DIN-rail mounted PLC power modules. IC Role / Device Role / Timing Role: Bulk rectifier feeding unregulated intermediate bus prior to DC-DC regulation. Use Value: –55°C to +125°C TJ range ensures reliability across extended industrial temperature cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS12 | Same 20 V VRRM and 1 A IF, but VF = 0.55 V (typ) at 1 A; RθJL = 30°C/W | Slightly higher conduction loss and thermal resistance; less suitable for space-constrained 125°C ambient designs | Select SK12B when lower VF and superior thermal performance are required in thermally aggressive layouts |
| SB120 | 20 V VRRM, 1 A IF, VF = 0.52 V (max) at 1 A; DO-214AA package; IR = 1 mA @ 25°C | Higher reverse leakage than SK12B (500 µA vs. 1 mA), limiting ultra-low-power standby efficiency | Prefer SK12B for battery-backed or energy-harvesting systems where sub-mA leakage is critical |
Compared with SS12 and SB120, the SK12B delivers the lowest forward voltage (0.50 V) and tightest reverse leakage (500 µA) within the 20 V/1 A SMB-class Schottky rectifiers, making it optimal for high-efficiency, thermally constrained adapter and lighting applications.
Availability
SK12B is available at Aetrix Electronics and suitable for AC/DC adapters, LED lighting drivers, and industrial DC-DC converters requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.
Supply support for SK12B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power management and signal conditioning markets since 1979.
The SK12B belongs to TSC's SKx series of Schottky rectifiers designed specifically for high-efficiency, cost-sensitive switching power supplies in consumer, industrial, and lighting applications.
FAQ
What is the maximum junction temperature rating for the SK12B?
The SK12B has a maximum junction temperature (TJ max) of +125°C, verified per absolute maximum ratings in the official TSC datasheet. This rating applies under continuous DC forward conduction at rated current and requires proper PCB thermal design. Operation beyond 125°C risks irreversible degradation of the Schottky junction. The SK12B must not be operated above this limit even for short durations unless transient derating curves are applied per Figure 1 in the datasheet.
Does the SK12B have a cathode band marking, and how is polarity identified?
Yes, the SK12B uses a visible cathode band on the molded plastic body to indicate polarity, consistent with DO-214AA (SMB) industry standards. The banded end is the cathode terminal, and the opposite end is the anode. This marking is clearly shown in the mechanical drawings on page 6 of the TSC SK12B–SK115B datasheet, and aligns with JEDEC DO-214 variation AA specifications.
What is the forward voltage specification for the SK12B at 1 A and 25°C?
The SK12B has a typical forward voltage (VF) of 0.50 V at 1 A forward current and 25°C junction temperature, as specified in the Electrical Specifications table on page 2 of the TSC datasheet. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the conduction loss baseline for efficiency calculations in SMPS output stages.
Is the SK12B suitable for reflow soldering, and what is its moisture sensitivity level?
Yes, the SK12B is qualified for standard lead-free reflow soldering and carries a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly. Its matte tin-plated leads meet J-STD-002 solderability requirements, ensuring robust wetting and joint integrity across common Pb-free and SnPb processes.
What packaging option is available for the SK12B, and how many units are per reel?
The SK12B is supplied in DO-214AA (SMB) package on tape-and-reel format, with 3,000 units per reel, as confirmed in the Ordering Information section of the TSC datasheet. This packaging supports automated pick-and-place assembly and is compatible with standard SMT feeders used in high-volume manufacturing environments.
SK12B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 125°C
SK12B FAQ
1.How can I place an order for SK12B through Aetrix?
Please submit a Request for Quotation (RFQ) for SK12B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SK12B reliable?
The price and inventory of SK12B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SK12B is usually 5 days.
3.What payment methods are accepted for SK12B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SK12B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SK12B?
SK12B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SK12B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SK12B?
For technical support, including SK12B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SK12B requirements.
6.How does Aetrix verify that SK12B is sourced from the original manufacturer or authorized distributors?
All SK12B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SK12B meets industry standards.
7.What is the process for return or replacement of SK12B?
All SK12B units undergo pre-shipment inspection (PSI). If there is an issue with SK12B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SK12B part is unused and in its original packaging.
Return procedure for SK12B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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